﻿using System;
using System.Collections.Generic;
using System.Web;
using NVelocity;
using NVelocity.App;
using Commons.Collections;
using NVelocity.Runtime;
using System.IO;
using NVelocity.Context;
using System.Text;

namespace BingZi.HY.Core.Templates
{
   
        /// <summary>
        /// NVelocity模板工具类 VelocityHelper
        /// </summary>
        public class VelocityHelper
        {
            private VelocityEngine velocity = null;
            private IContext context = null;

            /// <summary>
            /// 构造函数
            /// </summary>
            /// <param name="templatDir">模板文件夹路径</param>
            public VelocityHelper(string templatDir)
            {
                Init(templatDir);
            }

            /// <summary>
            /// 无参数构造函数
            /// </summary>
            public VelocityHelper() { }

            /// <summary>
            /// 初始话NVelocity模块
            /// </summary>
            public void Init(string templatDir)
            {
                //创建VelocityEngine实例对象
                velocity = new VelocityEngine();

                //使用设置初始化VelocityEngine
                ExtendedProperties props = new ExtendedProperties();
                props.AddProperty(RuntimeConstants.RESOURCE_LOADER, "file");
                props.AddProperty(RuntimeConstants.FILE_RESOURCE_LOADER_PATH, HttpContext.Current.Server.MapPath(templatDir));
                //props.AddProperty(RuntimeConstants.FILE_RESOURCE_LOADER_PATH, Path.GetDirectoryName(HttpContext.Current.Request.PhysicalPath));
                props.AddProperty(RuntimeConstants.INPUT_ENCODING, "utf-8");
                props.AddProperty(RuntimeConstants.OUTPUT_ENCODING, "utf-8");

                //模板的缓存设置
                props.AddProperty(RuntimeConstants.FILE_RESOURCE_LOADER_CACHE, true);              //是否缓存
                props.AddProperty("file.resource.loader.modificationCheckInterval", (Int64)30);    //缓存时间(秒)

                velocity.Init(props);

                //为模板变量赋值
                context = new VelocityContext();
            }

            /// <summary>
            /// 给模板变量赋值
            /// </summary>
            /// <param name="key">模板变量</param>
            /// <param name="value">模板变量值</param>
            public void Put(string key, object value)
            {
                if (context == null)
                    context = new VelocityContext();
                context.Put(key, value);
            }

            /// <summary>
            /// 显示模板
            /// </summary>
            /// <param name="templatFileName">模板文件名</param>
            public void Display(string templatFileName)
            {
                //从文件中读取模板
                Template template = velocity.GetTemplate(templatFileName);
                //合并模板
                StringWriter writer = new StringWriter();
                template.Merge(context, writer);
                //输出
                HttpContext.Current.Response.Clear();
                HttpContext.Current.Response.Write(writer.ToString());
                HttpContext.Current.Response.Flush();
                HttpContext.Current.Response.End();
            }

            /// <summary>
            /// 根据模板生成静态页面
            /// </summary>
            /// <param name="templatFileName"></param>
            /// <param name="htmlpath"></param>
            public void CreateHtml(string templatFileName, string htmlpath)
            {
                //从文件中读取模板
                Template template = velocity.GetTemplate(templatFileName);
                //合并模板
                StringWriter writer = new StringWriter();
                template.Merge(context, writer);
                using (StreamWriter write2 = new StreamWriter(HttpContext.Current.Server.MapPath(htmlpath), false, Encoding.UTF8, 200))
                {
                    write2.Write(writer);
                    write2.Flush();
                    write2.Close();
                }

            }

            /// <summary>
            /// 根据模板生成静态页面
            /// </summary>
            /// <param name="templatFileName"></param>
            /// <param name="htmlpath"></param>
            public void CreateJS(string templatFileName, string htmlpath)
            {
                //从文件中读取模板
                Template template = velocity.GetTemplate(templatFileName);
                //合并模板
                StringWriter writer = new StringWriter();
                template.Merge(context, writer);
                using (StreamWriter write2 = new StreamWriter(HttpContext.Current.Server.MapPath(htmlpath), false, Encoding.UTF8, 200))
                {
                    //write2.Write(YZControl.Strings.Html2Js(YZControl.Strings.ZipHtml(writer.ToString())));
                    //write2.Flush();
                    write2.Close();
                }

            }
        }
    
}


